Transformer radiator



Bahrain 1 9 W. M. DANN TRANSFORMER RADIATOR Filed Nov. 29., 1920 2 Sheets-Sheet 1 ATTORNEY March 1, 1927.

W. M. DANN TRANSFORMER RADIATOR Filed" Nov. 29 1920 2 Sheets-Sheet 2 INVENTOR Zd/fazg/Zfizgzz.

.ATT'ORNEY WITNESSES:

Patented Mar. 1, 1927.

UNITED STATES PATENT OFFICE. f

WALTER M. DANN, 0F WILKINSBURG, PENNSYLVANIA, ASSIGNOIR. TO WESTINGHOUSE ELECTRIC 86 MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

TRANSFORMER RADIATOR.

Application filed November 29, 1920. Serial No. 427,189.

My invention relates to heat dissipating devices, and ithas particular relation to apparatus of the above designated character that is peculiarly adapted for use in connection with electrical or other apparatus normally immersed within a cooling fluid. More specifically, my invention relates to means for cooling the oil, or other cooling fluid, used in transformers, or to other structures in which it is desired to employ an Oil-tight air-cooled radiator.

One object of my invention is to provide a radiator of such type as will facilitate a free circulation of fluid therethrough, and which will have a large amount of exterior radiating surface exposed to the air in proportion to the amount of fluid contained in the radiator.

Another object of my invention is toprovide a radiator so constructed as to offer a minimum amount of resistance to the passage of air currents between the individual units of the heater, and that shall insure a positive circulation of fluid through they radiator. a

Briefly, my inven on comprises constructing the radiator of a plurality of units, each of which is composed of two side-by-side members arranged to form a metallic envelope. These envelopes are provided near the ends with extruded portions having openings therein. Theextruded portions of adjacent envelopes are united, thereby supporting the envelopes and establishing com-' munication therebetween.

Heretofore, it hasbeen customary to construct radiators by connecting a plurality of pipes disposed in side-by-side relation between two spaced common end connections or header members. Such end connections or header members have been of the same or tors as portions of all of the radiator pipes are at least partially disposed therein.

In the accompanylng drawings, Figure 1 is a cross-sectional view of a transformer tank having mounted thereon a plurality of radiators constructed in accordance with my invention.

Fig. 2 is a side elevational view in enlarged detail of one of the radiators illustrated in Fig. 1. i

Fig. 3 is a cross-sectional view taken along the lines III-III of Fig. 2, illustrating one of two similar pressed metal members, which united, constitute a radiator unit.

Fig. 4- is a. cross-sectional View of two complete units of a radiator.

- Fig. 5 is a fragmentary vertical-sectional view, on an enlarged scale, of a portion of a radiator illustratin the method of attachlng together the ad acent units.

Fig. 6 is a perspective view of the member 7 shown in front elevation in Fig. 3.

Referring to the drawings, I show a tank .1 suitable for use with a transformer or other fluid immersed electrical apparatus, provided with a .plurality of radiators 2 disposed about the periphery thereof. Each of the radiators comprises a plurality of in dividual units 3. The radiators 2 are connected to the casing 1 by means of pipes 4 and 5 connected at the top and bottom thereof, respectively. The heated liquid rises in the tank 1, passes through the pipe 4 into the radiators 2, and moves downwardly in the rtfdiator as the liquid becomes cooled. movement results in the circulation of liquid through the radiator and tank,

Each of the radiator units 3 consists of two pressed metal members 6 of substantially dish-shape, as best shown in Figs. 3 and 6, which are substantially rectangular in contour and which-are provided with integral projections 7 and 8, or ears, at the respective ends thereof. When two of. the members 6 are properly united, they constitute a unit which is a substantially fiat rectangular sheet metal envelope.

The flat portion of each of'the enembers 6 is so pressed as to form a plurality of longitudinally extending ridges 9 which project This inwardly and the top surface of each of excent for restricted neck portions 11 which of the projections 7 and 8 of each unit are connect the projections 7 and 8 to the rectangular member 6. The portions 7 and 8 are each narrow but of greater thickness than is the main body portion of the radiator members, each being provided with extruded offset portions having an opening 12 in the central portion thereof which is provided with an annular flange 13 thereabout.

The two dish-shape members 6 are united by welding the external edges of the flanges 10 thereof which extend around the entire outer ed e including the offset members 7 and 8, t us providing an absolutely fluid tight unit except for the openings 12 in the members 7 and 8. The ridges 9 in the central portion of each member 6 are in the same plane as is the flange 10, so that when assem led, the co-operating ridge members 9 of the'two oppositely disposed pressed metal member 6 are in engagement.

After being assembled, the ridges 9 of the two members are spot-welded together so as to divide the main body portion of each of the envelopes or units 3 into four longitudinally extending channels 14, as best shown in Figs. 3, 4 and 6. The fact that these rid es are spot-welded serves to make the entire envelope strong and rigid, as compared with a similar member welded only at the edges. Also, these connections enable the unit to better withstand the excessive stresses set up by abnormal fluid pressure therein. Another purpose of these channels is to' prevent cross-currents of the cooling fluid within the envelope which would otherwise interfere with proper circulation therethrough. Furthermore, the depressions in the outer surface materially inorease'the external radiating surface of each unit.

The flanges 13 of the extruded portions welded to similar flanges on the adjacent units by means of an internal weld. This connection provides a passageway for the coolin fluid of the tank 1 to enter all of the units of the radiator and also provides a support for these units. The connection between the two similarportions of each individual unit are exterior welds, as best shown in Fig. 5'. Thus, alternate of the welded joints in a complete radiator section are exterior welds and the remainder thereof are interior welds. The innermost unit of each radiator section, that is, the unit next adjacent to the tank 1, is provided with pipes 15 and 16 which are provided with internal flan es 17 welded to the internal flange 13 of t e extruded top and bottom portions respectively, of the innermost radiator unit. The

pipes 15 and 16 are each provided with a coupling member 18'adapted to co-operate with a similar coupling member 19 mounted upon a pipe 20, which in turn is welded to the main tank 1. The coupling members 18 and 19, which are of substantially.diamond shape, are connected together by means of bolts or other adjustable threaded means 21 disposed within openings 22 in the coupling members.

The main body ortions of the radiator units are disposed in alinement as are, also, the respective offset portions 7 and 8. When the radiator-is assembled, the openings 22, and therefore, the bolts 21, are disposed without the area of projection of the radiator, that is to say, out of alinement with the offset portions 7 and 8. By means of this construction, the bolts may readily be removed to detach the radiators without interference from any portion thereof.

I have found that the mostelficient utilization of space in a radiator structure is to provide an air space of substantially twice the thickness of the oil space. In other words, the space between the individual units should be twice the thickness of the unit. units one-half inch .in thickness and spacing them apart one inch, the most satisfactory results are obtained. 7

It will be apparent that by the use of the relatively small ollset portions 7 and 8, I have eliminated the necessity of the expensive, inefficient and now commonl used header member. I have substituted t ereior a connection, the portions of which are integral with the main body portions of the r'adiatorunits and are, therefore, of more strong and durable construction. Less labor is required in assembling such structures than is necessary with 'the header type.

Also, a structure of such proportions is proy means of my invention, I have elimi-- nated" the commonly used header member I have found that, by making the and have substituted therefor a connection between the radiator units which is of rela tively small area, and therefore, permits of substantially unimpeded circulation of air between all of the units. Furthermore, I have provided a structure which is less complicated and less expensive than the header type of radiator and which is strong and durable in construction.

While in the description of my improved structure, I have stated thateach of the members which, united, form a unit are of substantially dish-shape, it will be obvious that my invention is broadenough to inconstituting the most desirable form of my invention are not absolutelyessential to the successful operation thereof. While I have shown but a single form of my invention, and have described in detail but a single application of the same, it will be obvious to those skilled in the art that it is not so limited but that various minor modifications and changes may be made therein without departing from the spirit and scope thereof, and I desire, there fore, that only such limitationsshall be imposed thereon as are set forth in the appended claims. v

I, claim as my invention:

1. A radiator composed of a plurality of units each of which comprises a pressed metal envelope having extruded endportions each provided with an opening in each side thereof that is. surrounded by, an inwardly extendingflange, the extruded end portions of adjacent units being welded together along said flanges.

- the adjacent units.

subscribed my 2. A radiator comprising a plurality of heat-dissipating units of sheet metal, each of said units "comprising a substantially fiat rectangular envelope provided with an integral ear portion at each end and'in extension thereof, and each of said ears being provided with openings surrounded by inwardly extending flanges for welding to 3. A radiator comprising a plurality of units of sheet metal, each of said units comprising complementary members of such form as to constitute a substantially rectangular envelope having longitudinal welds along the adjacent edges of said members whereby said units are integral, and each of said units having projecting portions with transverse openings therein surrounded by annular flanges that are welded to adjacent flanges to constitute an integral structure wherein the units are operatively .connected for circulating a cooling medium.

In testimony whereof, I have "hereunto name this 12th day of November, 1920.

WALTER M, mm, 

